PLATE CXI. 



Figures magnified 500 diameters. 



Figs. 1. '1. NAVICULA MACULATA. Edwards, Stuuroneis maculata, Bailey. 



M. J., 1860, M. 129; Schm. At., 62, f. 10; Sm. Sp. 

 T., No. 293. Near latissinia, vide Schultze's fig., 

 Bui. Torrey-Bot. Club, 1887, April. 



Fig. 3. PRETEXT A, var. (Ehrb.), Grundl. Camp. Bay. 



" 4. TRICERATIUM SCTTLPTUM, var. Gruudl. Atlantic City, Not- 



tingham, etc., Schm. At., 76, f. 12. 



" .">. AULISCUS PRUINOSUS, Bail. Gulf of Mexico. T. M. S., 1863. 



p. 49, PI. 3, f. 13; Schm. At., 31, f. 6, 7 ; 108, f. 10. 



" 6. SPINOSUS, T. Christian, closely allied to Glyphodis- 



i/x. Atlantic City, Bill. Torrey Bot. Club, March, 

 1889, p. 73. 



NAVICULA MARGINATA (Mastogloia), "Lewis N. and R. Sp., p. 

 26, 2, f. 1,'from photo. Charleston, South Caro- 

 lina. 



Kiu-s. s. 9. GRUENDLERI, A. S.; Schm. At., 12, f. 35-37. Cal. 



KILT. 10. VULPINA, (V. H., 9, f. 18), a var. of N. acuta, K. B., 



3, f. 69; Sin. Sp., No. 240. Lake Michigan. 

 11. SURIRELLA NOBILIS, N. S. Sporangial form, S. B. D., 8, f. 63.= 



Sur. splendida, var. Lake Michigan. 

 " 12. COSCINODISCUS VELATUS? From photo., S. C.; Schm. At., 62. 



f. 10. 

 l''igs. 13, 14. BIBLARIUM ELLIPTICUM, vars., Ehrlj. Mik., 33, 2, f. 5; 33, 12, f. 



2; M. D.,43, f. 38. 



15, 16. MERIDION GIRCULARE, var. contorta, Lake Michigan, fre- 

 quent. For. Mer. constrictum, compare Rail's. 

 A. N. H., 1843, p. 458, 18, f. 2; Rab. S. D., 1, f. 2; 

 and S. B. D., 32, f. 278. 

 I'M-. 17. EUPODISCUS ROGERSII, (Argus, var). Artesian well, Atlantic 



City, Schm. At. 92, f. 2-6. From photo. 

 is TRICERATIUM AMERICANUM, Raits.. S.-hm. At., 76, f. 3, 20. 



Artesian well, Atlantic City. 



lit. CYMBELLA BOTUNDATA, H. H. C. An extreme form ol this is 



Billed by Bailey Cy nib. gibba. Grunow calls the 

 same diatoms Encyonema triangulare. 



